CVE-2026-1707: pgAdmin Auth Bypass Vulnerability

CVE-2026-1707 Overview

pgAdmin versions 9.11 are affected by a Restore restriction bypass via key disclosure vulnerability that occurs when running in server mode and performing restores from PLAIN-format dump files. An attacker with access to the pgAdmin web interface can observe an active restore operation, extract the \restrict key in real time, and race the restore process by overwriting the restore script with a payload that re-enables meta-commands using \unrestrict <key>. This results in reliable command execution on the pgAdmin host during the restore operation.

Critical Impact

This race condition vulnerability allows authenticated attackers to bypass restore restrictions and achieve command execution on the pgAdmin host system during database restore operations.

Affected Products

• pgAdmin version 9.11 (Server Mode)
• Systems performing PLAIN-format dump file restores
• pgAdmin deployments accessible via web interface

Discovery Timeline

• 2026-02-05 - CVE CVE-2026-1707 published to NVD
• 2026-02-05 - Last updated in NVD database

Technical Details for CVE-2026-1707

Vulnerability Analysis

This vulnerability represents a race condition combined with an authorization bypass that affects pgAdmin's restore functionality when operating in server mode. The core issue lies in the exposure of the \restrict key during active restore operations, which is designed to prevent the execution of potentially dangerous meta-commands during PLAIN-format dump file restores.

The attack exploits a Time-of-Check Time-of-Use (TOCTOU) weakness where an authenticated attacker can observe an ongoing restore operation, extract the restriction key, and then modify the restore script before the operation completes. By injecting the \unrestrict <key> command with the captured key value, the attacker can disable the security restrictions that were intended to prevent arbitrary command execution.

The vulnerability requires network access and authenticated access to the pgAdmin web interface, but once these preconditions are met, the attack can be executed reliably against any restore operation using PLAIN-format dump files.

Root Cause

The root cause of this vulnerability is the exposure of the \restrict key during restore operations in a manner that allows observation by other authenticated users with web interface access. The security model assumes the restriction key remains confidential, but the implementation fails to adequately protect this key from disclosure during the restore process. Additionally, the restore script modification window allows for exploitation through a race condition.

Attack Vector

The attack requires an authenticated attacker with access to the pgAdmin web interface to monitor for active restore operations. When a restore operation using a PLAIN-format dump file is detected, the attacker can extract the \restrict key that is exposed during the operation. The attacker then races against the legitimate restore process to overwrite the restore script with a malicious payload that includes the \unrestrict <key> directive, effectively disabling the meta-command restrictions. Once restrictions are bypassed, the attacker can execute arbitrary commands on the pgAdmin host system within the context of the restore operation.

For detailed technical information about this vulnerability, refer to the GitHub Issue Discussion where the vulnerability mechanism is documented.

Detection Methods for CVE-2026-1707

Indicators of Compromise

• Unexpected modifications to restore scripts or dump files during restore operations
• Multiple concurrent access attempts to the same restore operation from different sessions
• Presence of \unrestrict commands in database restore logs or scripts
• Unusual command execution or process spawning during pgAdmin restore operations

Detection Strategies

• Monitor pgAdmin server logs for anomalous patterns during restore operations, particularly focusing on rapid successive accesses
• Implement file integrity monitoring on restore script directories to detect unauthorized modifications
• Audit authentication logs for suspicious access patterns to the web interface during restore windows
• Deploy endpoint detection to identify unexpected command execution originating from pgAdmin processes

Monitoring Recommendations

• Enable detailed logging for all restore operations in pgAdmin server mode
• Configure alerts for multiple users accessing the same restore operation simultaneously
• Monitor for the \unrestrict pattern in restore scripts and database logs
• Implement network traffic analysis to detect potential race condition exploitation attempts

How to Mitigate CVE-2026-1707

Immediate Actions Required

• Restrict access to the pgAdmin web interface to only trusted administrators until a patch is available
• Avoid performing PLAIN-format dump file restores in multi-user environments
• Consider using alternative restore formats that do not expose the restriction key mechanism
• Implement network segmentation to limit exposure of pgAdmin server mode deployments

Patch Information

Review the GitHub Issue Discussion for the latest information on patches and remediation guidance from the pgAdmin development team. Monitor official pgAdmin release channels for security updates that address this vulnerability.

Workarounds

• Disable server mode and run pgAdmin in desktop mode where multi-user access is not required
• Implement strict session isolation to prevent users from observing other users' restore operations
• Use network-level access controls to limit who can access the pgAdmin web interface during restore operations
• Consider performing sensitive restore operations during maintenance windows with restricted access

# Configuration example: Restrict pgAdmin access during restore operations
# Limit pgAdmin access to specific trusted IP addresses
# Add to firewall configuration or reverse proxy rules

# Example iptables rule to restrict access to pgAdmin port
iptables -A INPUT -p tcp --dport 5050 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 5050 -j DROP

# For nginx reverse proxy, restrict access during sensitive operations
# location /browser/restore {
#     allow 10.0.0.0/24;
#     deny all;
# }